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Precalculus

Course: Precalculus > Unit 9

Lesson 2: Geometric series (with summation notation)

Summation notation
Summation notation intro
Geometric series with sigma notation
Worked example: finite geometric series (sigma notation)
Finite geometric series
Finite geometric series word problem: social media
Finite geometric series word problem: mortgage

Finite geometric series

The geometric sequence a, start subscript, i, end subscript is defined by the formula:

a, start subscript, 1, end subscript, equals, 8
a, start subscript, i, end subscript, equals, a, start subscript, i, minus, 1, end subscript, dot, start fraction, 3, divided by, 4, end fraction

Find the sum of the first 25 terms in the sequence.

Stuck?

Precalculus

Course: Precalculus > Unit 9

Problem